Multiple Label columns present in thrift file, Single Label Column in SQL

[Sanjay-Ganeshan]

In the .thrift file, in FitEvent, the type of "LabelColumns" is list.
In CreateDb.sql, you store "LabelColumn" (no s in SQL) as a single string.
Are there supposed to be multiple label columns, separated by commas, in the SQL table? If so, we should change this to "LabelColumns" and add the appropriate comment

[hariharsubramanyam]

Thanks! Fixed!